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Ghella [55]
3 years ago
13

Solve. 40 - 3a = -23

Mathematics
1 answer:
Andru [333]3 years ago
6 0
The first answer is C. I did this by subtracting 40 from both sides which gave me: -3a=-63 Then I divided -3 from both sides which gave me a to equal 21. 

The second answer would be 15. I did this by subtracting 3 from both sides which gave me: 1/5n=3 Then I multiplied by 5 on both sides. I took the reciprocal of 1/5 which is 5 and it gave me n to equal 15.
I hope this helped you! Let me know if you have any questions! 
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In the geometric progression 1, 2, 4… what term is 512?
Levart [38]

The next term is double the previous term, so that the n-th term is given recursively by

\begin{cases}a_1=1\\a_n=2a_{n-1}&\text{for }n>1\end{cases}

This rule tells us that

a_2=2a_1

a_3=2a_2=2^2a_1

a_4=2a_3=2^3a_1

and so on, with the explicit rule

a_n=2^{n-1}a_1=2^{n-1}

for n\ge1.

If 512 is the k-th term in the sequence, then

512=2^{k-1}\implies\log_2512=\log_22^9=\log_22^{k-1}\implies9=k-1\implies k=10

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Felicia put $8500 into a CD that pays 2.8% interest compounded semiannual. According to the rule of 72, approximately how long w
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I NEED HELP PLEASE!<br><br> If you can help me with this you amazing!<br><br> Thank you
krek1111 [17]

Answer:

a=-3

Step-by-step explanation:

we have

a-2=\frac{3+6a}{3}

Solve for a

That means ----> Isolate the variable a

Factor 3 in the numerator right side

a-2=\frac{3(1+2a)}{3}

Simplify right side

a-2=1+2a

subtract a both sides

a-2-a=1+2a-a

-2=1+a

subtract 1 both sides

-2-1=1+a-1

-3=a

Rewrite

a=-3

6 0
3 years ago
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